Sintering, oxidation and mechanical properties of hot pressed aluminium nitride

Thermal oxidation of polycrystalline and single crystalline aluminum nitride wafers

“…The oxide thickness is approximated as 57 nm, 122 nm, and 180 nm, respectively, according to the equation (6) where t 0 is the thickness as read from the chart for silica film with refractive index n 0 (2.11), and n f is the refractive index of aluminum oxide (Ϸ1.79). 14 The oxide thickness on single crystalline AlN is higher than that on polycrystalline AlN under the same oxidation conditions. The color of oxide on single crystalline AlN is more uniform than on polycrystalline AlN, which is expected, since single crystalline AlN has a higher crystal quality, a more uniform crystal orientation, and stress.…”

Influence of the de-waxing atmosphere on the properties of AlN ceramics processed from aqueous media

“…Due to the easy oxidation of aluminium nitride in presence of oxygen and the residual carbon supplied by the organic species during burnout, the de-waxing atmosphere is a critical parameter. [23][24][25][26][27] This work aims at studying the influence of de-waxing atmospheres on sintering and final properties of AlN processed in aqueous media. The water-based suspensions containing a binder and plasticizers were freeze granulated and the as obtained powders were used to consolidate AlN samples by dry pressing.…”

Processamento, propriedades e aplicações das cerâmicas de nitreto de alumínio

“…Este efeito está detalhado em [90]. De modo geral, as cerâmicas "densas" de AlN (sem e com aditivo de sinterização) apresentam valores de E entre 300 e 335 MPa [14,90,92,93,97,110,[114][115][116][117], enquanto as cerâmicas "densas" de Al 2 O 3 possuem valores de E entre 400 e 420 MPa [14,103,107,108]. Estes resultados mostraram que as cerâmicas de AlN apresentam rigidez menor do que as cerâmicas de Al 2 O 3 .…”